科施恩，是多本暢銷書的作者或閤著者，其中有關於C語言的，包括《Programming in C》（Sams，2004）、《Programming in ANSI C》（Sams，1994）和《Topics in C Programming》（Wiley，1991），也有關於UNIX的，包括《Exploring the Unix System》（Sams，1992）和《UNIX Shell Programming》（Sams，2003）。從1984年Mac最初引入時，他就已經在Macintosh計算機上進行程序設計瞭，他編寫的《Programming C for the Mac》是Apple Press Library的一部分。

Programming in Objective-C, Fifth Edition Updated for OS X Mountain Lion, iOS 6, and Xcode 4.5 Programming in Objective-C is a concise, carefully written tutorial on the basics of Objective-C and object-oriented programming for Apple's iOS and OS X platforms. The book makes no assumptions about prior experience with object-oriented programming languages or with the C language (which Objective-C is based upon). Because of this, both beginners and experienced programmers alike can use this book to quickly and effectively learn the fundamentals of Objective-C. Readers can also learn the concepts of object-oriented programming without having to first learn all of the intricacies of the underlying C programming language. This unique approach to learning, combined with many small program examples and exercises at the end of each chapter, makes Programming in Objective-C ideally suited for either classroom use or self-study. This edition has been fully updated to incorporate new features in Objective-C programming introduced with Xcode 4.4 (OS X Mountain Lion) and Xcode 4.5 (iOS 6.) "The best book on any programming language that I've ever read. If you want to learn Objective-C, buy it." -Calvin Wolcott "An excellent resource for a new programmer who wants to learn Objective-C as their first programming language-a woefully underserved market."-Pat Hughes Contents at a Glance 1 Introduction Part I The Objective-C Language 2 Programming in Objective-C 3 Classes, Objects, and Methods 4 Data Types and Expressions 5 Program Looping 6 Making Decisions 7 More on Classes 8 Inheritance 9 Polymorphism, Dynamic Typing, and Dynamic Binding 10 More on Variables and Data Types 11 Categories and Protocols 12 The Preprocessor 13 Underlying C Language Features Part II The Foundation Framework 14 Introduction to the Foundation Framework 15 Numbers, Strings, and Collections 16 Working with Files 17 Memory Management and Automatic Reference Counting (ARC) 18 Copying Objects 19 Archiving Part III Cocoa, Cocoa Touch, and the iOS SDK 20 Introduction to Cocoa and Cocoa Touch 21 Writing iOS Applications Appendixes A Glossary B Address Book Program Source Code